What is the Hemodynamics in ASD ?

The essential hemodynamic feature of ASD is right ventricular volume overload.

When there is RV volume overload it produces the following effect.

• Right ventricle compress on the let ventricle producing reverse Bernheim effect on the interventricular septum.
• Right ventricle compress on the coronary arteries.

What are the main fectors that determine the shunt in ASD

Shunt in ASD is determined by

• Size of septal defect
• Relative distensibility of the left and right ventricle.
• Pulmonary as well as systemic vascular resistance.

Large septal defect produce the following effects

• Cardiomegaly 
• Load ejection systolic murmur with thrill in the pulmonary area
• Tricuspid midiastolic murmur

These three factors are used to access the size of ASD

Describe about ASP with bidirectional shunt

This is ASD with shunt occurring in either direction, based on pulmonary and systemic vascular resistance.

Patients may present with clubbing and cyanosis on exertion. There will be features of left to right shunt such as pulmonary ESM and tricuspid MDM.

Read related topics -ASD

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2. What is the effect of PAH on physical signs of ASD ?
3. What are the complications of ASD ?
4. What are the investigation findings in ASD (atrial septal defect) ?
5. What are the Murmurs in atrial septal defect?
6. Why there is Fixed split in ASD
7. How will you clinically diagnose atrial septal defect?
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9. Development of interatrial septum
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